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Geoscience ›› 2019, Vol. 33 ›› Issue (03): 514-524.DOI: 10.19657/j.geoscience.1000-8527.2019.03.05

• Geochemistry • Previous Articles     Next Articles

Geochemical Characteristics and Influence Factors of Lead in the Soils of the Pearl River Delta Plain, China

GUO Siyu1(), HOU Qingye1(), ZONG Qingxia2, TANG Zhimin3, WEI Bin1, PANG Shiqi1   

  1. 1. School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China
    2. Yunnan Institute of Geological Survey,Kunming,Yunnan 650216 ,China
    3. Nanjing Center, China Geological Survey,Nanjing,Jiangsu 210016,China
  • Received:2018-08-02 Revised:2018-10-30 Online:2019-06-23 Published:2019-06-24
  • Contact: HOU Qingye

Abstract:

This paper took the Pearl River Delta plain in Guangdong Province as the study area. We collected 102 surface soil samples from paddy fields and analyzed their physico-chemical parameters and Pb geochemical fractions.The main aims were to investigate the geochemical characteristics and to discuss the influence factors of total Pb contents and mobility fraction Pb contents in the soils. The results showed that the average value of total Pb contents in the soils was 46.47 mg/kg, which was slightly higher than the background value of soil Pb in Guangdong Province (36 mg/kg), indicating a certain accumulation trend. From northwest land sedimentary environment to south sea-land interaction sedimentary environment, the elements contents in the soils normally increased. Soil Pb were mainly composed of residual and Fe-Mn oxidation fraction with weak mobility. The factors affecting total Pb contents in the soils are aluminum oxide(Al2O3),potassium oxide (K2O),thallium(Tl),molybdenum(Mo). The factors controlling the mobility fraction of Pb are total Pb contents, pH, organic matter contents, cation exchange capacity (CEC), phosphorus(P), iron oxide(TFe2O3) and manganese (Mn). Among these factors, pH is the most important factor controlling the mobility of soil Pb.

Key words: the Pearl River Delta plain, soil, Pb, geochemical fraction, influence factors

CLC Number: